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3725. Koehler, F.E.. 1959. Fertilizer interactions in wheat producing areas of eastern Washington.. Proceedings, 10th Ann. Fert. Conf. PNW, Tacoma, WA, p.19-21.
The most frequently observed nutrient interaction in the wheat producing area of eastern Washington is that between sulfur and nitrogen under annual cropping. Where no sulfur was added, yields were increased by about 8 bushels per acre, and 30 lbs N/ac resulted in slightly better yields than did 120 lbs. When one lb sulfur was added per acre, yield increases from nitrogen were about 15 bu/ac, and again there was little difference between the effects of 30 and 120 lbs of N. However, where the sulfur rate was 10 lbs/ac, the yield increase with 30 lb N was 20 bu/ac and that with 120 lb N was 30 bu/ac. In no case did sulfur alone appreciably increase yields.
3865. Leggett, G.E.. 1959. Relationships between wheat yield, available moisture and available nitrogen in eastern Washington dryland areas.. WA Agr. Expt. Sta. Bull. #609.
The purpose of this work is to demonstrate the relationships which exist between (1) available moisture and wheat yield and (2) available nitrogen and wheat yield. Using these relationships, it is possible to calculate the amount of fertilizer nitrogen necessary to obtain maximum wheat yield if the supply of available nitrogen in the soil and the amount of moisture available for the crop can be estimated. The results of 90 fertility experiments conducted on dryland wheat in eastern Washington during the period 1953-1957 were used to determine the relationship between wheat yield and available moisture. The results of 62 experiements were used to determine the relationship between wheat yields and available nitrogen. It is possible to calculate nitrogen fertilize recommendations from the results of soil tests for nitrate-nitrogen and available soil moisture by use of these relationships.